"Session no found", using blueprints and Steam Subsystem

I am trying to create multiplayer using this guide series Blueprint Multiplayer: Find a Match Graph | 11 | v4.11 Tutorial Series | Unreal Engine - YouTube

And know i can’t connect to created on another PC session( another steam account). “Session not found” neither using LAN nor Steam.

While i was fixing bugs i had 2 succesful tests, but only when max amout of players were higher then ~30.

Logs shows nothing. A lot of wrong session bc of id480, but there is no mine.
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And actually I’ve tested out that if i am finding session with 30 empty slots(using advanced steam plugin. Now i turned it off), finding is much quicker, than with 1. I am trying to say that my session affect on the finding, but in the logs i cant see it.

So thats the question, what can be the problem?